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Restructuring and Impairment Activities (Tables)
 12 Months Ended
Dec. 31, 2014
Restructuring and Related Activities [Abstract]  
Changes in restructuring liabilities
Changes in the restructuring liabilities, substantially all of which are employee-related, are summarized as follows ($ in millions):
 
2014
 
2013
Balance at beginning of year
$
4.7

 
$
3.4

Accruals for announced programs
11.2

 
3.9

Cash payments
(6.3
)
 
(2.7
)
Exchange rate impacts
(0.9
)
 
0.1

Balance at end of period
$
8.7

 
$
4.7